function Map(el){
    this.el = el
    this.width = 800
    this.height = 400
}
Map.prototype.create = function(){
     this.el.style.width = this.width + 'px'
     this.el.style.height = this.height +'px'
     this.el.style.background = 'url(./bg.png)'
     this.el.style.border = '10px solid green'
     this.el.style.position = 'relative'
}